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E39 (1997 - 2003) The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

I am new here but I have been a "lurker" for awhile while I learn. I think I might finally be able to contribute I was wondering if anyone had any ideas or thoughts here. I was thinking it could be a pump somewhere or potentially a belt or tensioner somewhere, but based on where I can hear the sound best, I am stumped.

I have seen a couple of these idle whistles and I've tried the intake fix but that wasn't it. As you can see from the video, the sound is loudest under the car or through the wheel, but from the engine bay, it's not very audible.